Sheave



No. 238,579. Patented March 8,1881.

IINIIEE STATES ATENT OFFICE,

CHARLES ELLIS, OF EAST GLOUCESTER, ASSIGNOR TO HIMSELF AND FREDERICK S.ANDREWS, 0F GLOUCESTER, MASSACHUSETTS.

SH EAVE.

SPECIFICATION forming part of Letters Patent No. 238,579, dated March 8,1881.

Application filed December 21, 1880. (No model.)

To all whom it may concern Be it known that I, CHARLES ELLIs, of EastGloucester, of the county of Essex and State of Massachusetts, haveinvented a new and useful Improvement in Sheaves; and I do herebydeclare the same to be described in the following specification andrepresented in the accompanying drawings, of which Figure 1 is alongitudinal section, and Fig. 2a transverse section, of a sheaveprovided with my invention, the nature of which is defined in the claimhereinafter set forth.

The sides of the said sheave consist of two disks, A B, which arearranged parallel to each other, and have between them a series ofintervening cross bars or pieces, a a, placed at equal distances apart,and in a circle concentric with the periphery of each disk. A centralwheel, C, arranged between the disks, is shown as having a prismaticeye, I), to receive a shaft. Extending around the central wheel is aseries of other and smaller wheels or friction-rollers, 1), they beingarranged between the cross-pieces a a in manner as shown. Each wheel Dis to revolve on a fixed pin, 0, extending from one disk to the other.The range of friction-wheels I) rests and runs on the periphery of thecentral wheel while the sheave is being revolved. Encompassing therollers D and the cross-pieces a, is an annulus, E, which rests on oneor more of the rolls D, and is grooved in its periphery, as shown. Thisannulus is recessed on its opposite sides to receive the two disks.

In the operation of this sheave the central wheel is to be supposed tobe stationary, in which case the wheels D are to revolve on such centralwheel, the grooved annulus or ring E revolving in turn on the series ofwheels D.

I am aware that it is not new to apply to a car-wheel and within astationary housing a series of friction-rollers, arranged around the hubof the wheel and in a carrying-frame. This,

though somewhat analogous to my invention, differs therefrom materially,as I have no carwheel, and have an annulus grooved peripherally andrecessed in its sides to receive the two disks, which, besides answeringto support the friction-wheels, extend beyond them into the recesses ofthe sides of the grooved annulus,'and thus serve with such to supportthe grooved annulus upon the series of fric- Lion-wheels.

I am also aware that a sheave composed of a grooved and recessedannulus, two side disks, a central wheel, and a series of anti frictionwheels is not new, such being shown in the United States Patent No.223,795. In the said sheave the two disks were fastened to the groovedand recessed annulus and revolved with it; whereas in my sheave thegrooved and recessed annulus is not fixed to the disks, but revolvesindependently of them, while supported by them, they being held togetherby the cross-pieces a, which intervene between them and thefriction-rollers. Thus it will be seen that there are importantdifferences between my sheave and that shown in the saidpatent.

What I claim as my invention is as follows, viz:

The combination of the disks AB and their intervening and supportingcross-pieces a with the series of wheels D, the central whee], C, andthe grooved and recessed annulus E, disconnected from and arrangedbetween and supported by the said disks A B, so as to revolveindependently of them upon and around the wheels D, while the latter maybe revolving on the central wheel, C, all being substantially as setforth.

CHARLES ELLIS. Witnesses:

JOHN C. PIERCE, WILLIAM W. FRENCH.

